I just rebuilt the steering box on my 52 last summer. There is a seal where the pitman arm attaches to the steering box. I spoke to the bulk supplier where I used to work, and there are some 3 and 4 000 greases available. He suggested I go to JD. and get a tube of corn head grease for this application. A tube cost 1.87 here and is enough to fill 3 or 4 steering boxes, or in my case the same box a couple of times (don't ask) LOL